FeO and H2O and the homogeneous accretion of the earth

Details FeO and H2O and the homogeneous accretion of the earth FeO and H2O and the homogeneous accretion of the earth

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..71..111l&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 71, no. 1, Nov. 1984, p. 111-119. Previously announced in STAR as N84

Computer Science

24

Deposition, Iron Oxides, Water, Earth Mantle, Earth Surface, Enstatite

Scientific paper

The authors present new shock devolatilization recovery data for brucite (Mg(OH)2) shocked to 13 and 23 GPa. These data combined with previous data for serpentine (Mg3Si2O5(OH)4) are used to constrain the minimum size terrestrial planet for which planetesimal infall will result in an impact-generated water atmosphere. Assuming a chondritic abundance of minerals including 3 - 6%, by mass water, in hydrous phyllosilicates, the authors carried out model calculations simulating the interaction of metallic iron with impact-released free water on the surface of the accreting Earth. In order to obtain ≡1025 g of atmospheric water by the end of accretion, slightly heterogeneous accretion with initially 36% by mass iron planetesimals, as compared to a homogeneous value of 34% is required. Such models yield final FeO budgets, which either require a higher FeO content of the mantle (17 wt.%) or oxygen as a light element in the outer core of the Earth.

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